A 0.12-m radius grinding wheel takes 2.1 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
a. 9.6 rad/s2
c. 1.6 rad/s2
b. 4.3 rad/s2
d. 0.33 rad/s2
B
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Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?
a. electromagnetic character c. wave nature b. particle nature d. polarization
Newton's Second Law in 1 Dimension: A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?
Fill in the blank(s) with the appropriate word(s).
Imagine that you could put three electrons into isolation in a box. Initially, electrons A and B have kinetic energy E0 and electron C has kinetic energy 2E0. After isolation from observation for a short time, you examine the electrons again and find that one electron has energy 2E0 and two electrons have energy E0
Assume for this problem's sake that the electrons can transfer energy to one another but only in increments of E0. Assume also that all electrons are exactly the same. What is the probability that the higher energy electron is electron C?
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The kinetic energy of the crate is 1/2 mv2
a. True b. False Indicate whether the statement is true or false